Search results for "SPECTROMETRIE IR"
showing 10 items of 11 documents
Silver ion chromatography and gas chromatography-mass spectrometry in the structural analysis of cyclic monoenoic acids formed in frying oils
1993
International audience
Volatile compounds extracted from polypropylene sheets by hot water :influence of the temperature of sheets injection
1993
A study was made on polypropylene (PP) pellets degraded and not degraded and pointed out the presence and olfactive importance of volatile components extracted from PP pellets by hot water. Plastic packaging materials correspond to a further step of manufacturing: the injection step, and this is often conducted at high temperature. PP (not degraded) and PP-CR (degraded) were transformed into sheets at several temperatures; Lickens-Nickerson extracts were made and allowed the quantification of volatile compounds already identified. A statistical analysis showed that temperature was a very significant parameter. An increasing injection temperature (275 or 300°C° creates increasing quantities …
Composition and major odorous compounds of the essential oils of Bifora radians, an aldehyde-producing weed
1991
International audience
Identification of a new volatile compound in onion (Allium cepa) and leek (Allium porum) : 3,4-dimethyl-2,5-dioxo-2,5-dihydrothiophene
1980
International audience
Effect of culture parameters on the production of styrene (vinyl benzene) and 1-octene-3-ol by Penicillium caseicolum
1992
SummaryPenicillium caseicolum has been shown to completely synthesize styrene. A medium was developed to test the capacity of different strains for this synthesis. In a synthetic medium, styrene production began only after the glucose was entirely consumed. This production depended on storage temperature and occurred simultaneously with 1-octene-3-ol formation.
Composition of the essential oils of blackcurrant buds ( Ribes nigrum L. )
1990
International audience
Le couplage CPG/IRTF dans l'analyse des aromes
1992
National audience
Cyclic fatty acid monomers : synthesis and characterization of methyl w-(2-alkylcyclopentyl) alkenoates and alkanoates
1988
Abstract Some 1,2-disubstituted cyclopentanes were synthesized. These were methyl 9-(2-butyl-cyclopentyl)-8-nonenoate, methyl 7-(2-hexyl-cyclopentyl)-6-heptenoate and methyl 5-(2-octyl-cyclopentyl)-4-pentenoate and their corresponding alkanoates. The synthesis involved a Michael addition of alkylmagnesium bromide to an unsaturated cyclic ester. The resulting cis and trans ethyl 2-alkylcyclopentane carboxylate were further converted to the alcohols then to the aldehydes. The aldehydes were condensed with the ylide derived from the (ω-carboxyalkyl)-triphenylphosphonium bromide and methylsulfinylmethide in DMSO to give unsaturated C18 cyclic fatty acid monomers. These cyclic fatty acids were f…
4 hydroxy-5-methyl-3furanone and 4-hydroxy-2,5-dimethyl-3(2H)-furanone, two components of the male sex pheromone of Eurycotis floridana (Walker) (Ins…
1993
45 ref.; International audience
Impiego dell'analisi gas-cromatografica e olfaattometrica nello studio dell'aroma del vino ottenuto dall'uva falanghina
1993
International audience